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H3A is a weak triprotic acid (K(a1) =...

`H_3A ` is a weak triprotic acid ` (K_(a_1) =10^(-5) ,K_(a_2) =10^(-13) ) . `What is the value of pX of 0.1 M `H_3 A(aq.) ` solution ? Where pX ` =- log X and X = ([A^(3-)])/([HA^(2-)]) `

A

`7`

B

`8`

C

`9`

D

` 10`

Text Solution

Verified by Experts

The correct Answer is:
D
` H^(+)` ions from ` I^(st) ` step is only considered
` [H^(+) ] =sqrt(Ka_1 xx C) =sqrt( 10 ^(-6)) =10 ^(-3) M`
` X =([A^(3-)])/( [HA^(_2) ]) =(Ka_3)/([H^(+) ] ) rArr X =10 ^(10) rArr pX =10 `
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AAKASH SERIES-IONIC EQUILIBRIUM -ADDITIONAL PRACTICE EXERCISE (LEVEL -II PRACTICE SHEET (ADVANCED) (Straight Objective Type Questions))
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  2. A buffer solution 0.04 M in Na2HPO4 and 0.02 M in Na3 PO4 is prepared...

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  3. When a 20 mL of 0.08 M weak base BOH is titrated with 0.08 HCl , the p...

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  4. A solution is 0.01 M Kl and 0. 1 M KCl . If solid AgNO3 is added t...

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  5. if 500 mL of 0.4 M AgNO3 is mixed with 500 mL of 2M NH3 solution the w...

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  6. The simultaneous solubility of Ag CN (K(f) =2.5 xx 10^(-16) ) and Ag...

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  7. Solubility of Ag CN is maximum in:

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  8. Ag Br(s) + 2S2O(3(aq) ) ^(2-) hArr Ag (S2O3)(2(aq) ) ^(3-) +Br(aq) ^(...

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  9. What is [Ag^(+) ] in a solution made by dissolving both Ag2 CrO4 and ...

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  10. H3A is a weak triprotic acid (K(a1) =10^(-5) ,K(a2) =10^(-13) ) ...

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  11. A buffer solution 0.04 M in Na2HPO4 and 0.02 M in Na3 PO4 is prepared...

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  12. When a 20 mL of 0.08 M weak base BOH is titrated with 0.08 HCl , the p...

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  13. A solution is 0.01 M Kl and 0. 1 M KCl . If solid AgNO3 is added t...

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  14. if 500 mL of 0.4 M AgNO3 is mixed with 500 mL of 2M NH3 solution the w...

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  15. The simultaneous solubility of Ag CN (K(f) =2.5 xx 10^(-16) ) and Ag...

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  16. Solubility of Ag CN is maximum in:

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  17. Ag Br(s) + 2S2O(3(aq) ) ^(2-) hArr Ag (S2O3)(2(aq) ) ^(3-) +Br(aq) ^(...

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  18. What is [Ag^(+) ] in a solution made by dissolving both Ag2 CrO4 and ...

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